Class: Senv::EnvChangeTracker

Inherits:
BasicObject
Defined in:
lib/senv.rb

Constant Summary collapse

THREAD_SAFE = 
::Monitor.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env) ⇒ EnvChangeTracker

Returns a new instance of EnvChangeTracker.



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# File 'lib/senv.rb', line 549

def initialize(env)
  @env = env

  @changes = {
    :deleted => [],
    :updated => [],
    :created => [],
  }

  @change_for = proc do |key, val|
    if @env.has_key?(key)
      case
        when val.nil?
          {:type => :deleted, :info => [key, val]}
        when val.to_s != @env[key].to_s
          {:type => :updated, :info => [key, val]}
        else
          nil
      end
    else
      {:type => :created, :info => [key, val]}
    end
  end

  @track_change = proc do |key, val|
    change = @change_for[key, val]

    if change
      @changes[change[:type]].push(change[:info])
    end
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



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# File 'lib/senv.rb', line 586

def method_missing(method, *args, &block)
  @env.send(method, *args, &block)
end

Class Method Details

.track(&block) ⇒ Object 



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# File 'lib/senv.rb', line 627

def EnvChangeTracker.track(&block)
  THREAD_SAFE.synchronize do
    env = EnvChangeTracker.new(::ENV)

    ::Object.send(:remove_const, :ENV)
    ::Object.send(:const_set, :ENV, env)

    begin
      block.call
      env
    ensure
      ::Object.send(:remove_const, :ENV)
      ::Object.send(:const_set, :ENV, env)
    end
  end
end

Instance Method Details

#[]=(key, val) ⇒ Object 



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# File 'lib/senv.rb', line 590

def []=(key, val)
  @track_change[key, val]
  @env[key] = val
end

#apply(env) ⇒ Object 



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# File 'lib/senv.rb', line 612

def apply(env)
  @changes[:created].each do |k, v|
    env[k] = v
  end
  @changes[:updated].each do |k, v|
    env[k] = v
  end
  @changes[:deleted].each do |k, v|
    env.delete(k)
  end
  @changes
end

#changes ⇒ Object 



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# File 'lib/senv.rb', line 582

def changes
  @changes
end

#delete(key) ⇒ Object 



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# File 'lib/senv.rb', line 607

def delete(key)
  @track_change[key, nil]
  @env.delete(key)
end

#replace(hash) ⇒ Object 



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# File 'lib/senv.rb', line 595

def replace(hash)
  hash.each do |key, val|
    @track_change[key, val]
  end
  @env.replace(hash)
end

#store(key, val) ⇒ Object 



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# File 'lib/senv.rb', line 602

def store(key, val)
  @track_change[key, val]
  @env.store(key, val)
end